Hi Brian,

Did you try turning off all object snaps to see if navigating the viewport speeds up? The reason I ask is because I've noticed that things can get pretty sluggish if there are a lot of curves and I use something to control the viewports other than the pan/zoom/rotate buttons. Like using a SpaceMouse creates this problem. I think it's because the pan/zoom/rotate buttons temporarily disable calculation of object snaps by the CPU, but navigating with a SpaceMouse doesn't.

So, if you're not using the pan/zoom/rotate buttons you might try using them instead, or try manually turning off object snaps to see if it's the object snap calculation part that's slowing things down.

- Peer